Answer :
All decide to leave a 20% tip based on the total bill before tax.
Total value of tip is $5.85
Given :
At a restaurant, Brianna and Naomi each order an appetizer for $6.50 and an entree for $9.75.
Total bill = appetizer cost for three persons + entree fee
Total bill =[tex]6.50 (3)+9.75=29.25[/tex]
So total bill is $29.25
Tip left is 20% of the total bill
Now we find the total value of tip
Total value of tip =20% times 29.25
[tex]Total \; value =0.20 \cdot 29.25=5.85[/tex]
The total value of tip is [tex]5.85[/tex] dollars
Learn more: brainly.com/question/19298065